- Jul 21, 2010
Sort of. A telephoto design is one where the physical length of the lens is shorter than the focal length. For example, the EF 100mm f/2 is a telephoto design – it’s about 74mm long. However, the EF 100mm f/2.8 Macro lenses are around 120mm long and thus are not telephoto designs.A 'telephoto' lens being >85mm?